JPS62502322A - Reamer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Lima Technical field TECHNICAL FIELD The present invention relates to tools for performing hole-drilling operations, and more particularly to reamers.

Background technology Previously published on March 13, 1974, published on February 15, 1981, Soviet Inventor Certificate No. 807259 Nyorori-ma is known. This conventional reamer is It consists of a toothed section having an interconnected cutting section and a calibrating section. and In this calibration section, at least part of the back surface is visible - extending away from the upper part of the It is shaped like a strip.

The front angle of the reamer teeth has a single and the same value along its entire length. Because of this, the conventional reamers described above were unable to produce the desired closing effect.

This smoothing effect affects the properties of drilling operations, especially the properties of flexible metals and alloys. It is something to lose.

Conventional reamers are used for preliminary reaming of holes in flexible metals and alloy materials. It was used only for

Reaming of holes in other alloy materials is also performed with precision up to characteristic 9 (H9). As a result, the roughness of the opening surface is Ra-1.6 mcm.

Disclosure of invention The present invention solves the problems for improving the reamer, namely the front surface of the teeth. The corners provide stable and high properties for drilling work in various materials including flexible materials. The purpose is to provide.

The solution to the problem is to provide toothed parts each having a cutting part and a calibrating part. , at least a portion of the back surface of the calibration section is formed into a strip shape that spreads away from the top. It is a reamer that has been It is characterized by having a frontal angle that decreases to = This tooth shape provides a highly smoothing effect on the drilled surface. This provides a relatively easy cutting effect. This is because the cutting part of the tooth part has a positive back angle. This is because the front angle has increased with It becomes relatively easy. For the tooth calibration part, the back angle α - 0 and the minimum front angle γ The value gives this calibration part a smoothing effect (calibration effect). This improves the opening properties. can be done.

Preferably, the reduction in the front angle of the teeth is at least 8" along the entire length. Yes.

If the reduction value of the front angle is less than 8 degrees, is the closed slip effect due to bamboo? jllU62-502 322(2), the reamer cannot provide high aperture properties.

Brief description of the drawing The present invention will be appreciated from the following detailed description of exemplary embodiments, taken in conjunction with the accompanying drawings. It will be better understood by doing so.

FIG. 1 is a schematic diagram of a four-groove reamer according to the present invention.

(Broken side view).

FIG. 2 is a cross-sectional view of the tooth surface (■--■) of the cut portion of the tooth.

FIG. 3 is a cross-sectional view of the tooth surface (■-■) of the cut portion of the tooth.

FIG. 4 is a sectional view of both teeth on the IV-rV plane of the cut portion of the teeth.

FIG. 5 is a v-v plane tooth part view of the cut part of the tooth part.

BEST MODE FOR CARRYING OUT THE INVENTION As shown in FIG. 1 of the accompanying drawings, the disclosed reamer is composed of a working part 1 and a shaft 2. has been done. Further, the working portion 1 of the reamer is provided with a tooth portion 3; has a back surface, a cutting section 4 and a calibration section 5 which are connected to each other.

This calibration part has a positive back angle α (FIG. 2).

At least a part of the back side of the calibration part 5 has a band extending away from the upper part 6 of the reamer. It is plate-shaped.

As a special case, as shown in Figure 1, the reamer has a loose back surface of the calibration section 5. It is constructed in the form of a widening strip. This strip is separated from the upper part 6 of the reamer. It is expanding in the direction of

Each tooth 3 of the reamer has a front face 7. The front angle of the tooth portion 3 is as shown in Fig. 2, As shown in FIGS. 3, 4 and 5, the It is slowly decreasing. That is, γ1〉 γ2゜ γ2〉 γ3. Ku γ3〉 γ4゜In this case, the reduction value of the front angle of the tooth 3 is smaller along the entire longitudinal direction. It is at least 8".

The system thus disclosed operates as follows.

When drilling a hole using the Nyorori ma of the present invention, the front angle γ1. γ2. γ3. γ The work starts from the cutting part 4 of the tooth part 3 having the positive back surface. It has a maximum value for angle α.

For this reason, the cutting operation is relatively easy.

This is important when drilling flexible materials, alloys, etc.

The cutting section 4 is taken over by the calibration section, whose front angle is from Lγl to L It gradually decreases to γ4.

This shows the following. That is, it does not have a positive back angle α and has a minimum front The calibration part 5 having corners has the function of improving and smoothing the surface roughness characteristics of the drilled hole. It is equipped with high accuracy. Therefore, the advanced cutting function with a single tooth and the advanced By combining the calibration function, the accuracy can be increased up to the 6th characteristic (H6), and the surface roughness can be improved. It is possible to perform hole-drilling work with Ra of up to 0.2 mcm.

Industrial applicability The present invention can be most effectively used in punches, lathes, drills, construction block machining tools, etc. Also, the accuracy is the 6th characteristic (H6) and the surface roughness is up to Ra-0.2mcm. It is also used in automated continuous work lines that drill holes with precision.

The present invention can also be used to perform precision drilling work with a machining center type machine tool. used.

V international va inspection failure

Claims (2)

[Claims] 1. It has a tooth part (4) and a calibration part (5) that connect with each other, and at least the back side of the calibration part The reamer also has a strip-like shape with a portion expanding away from the top (6) of the reamer. and each tooth (4) gently moves away from the top (6) of the reamer. A reamer characterized in that it has a decreasing front angle. 2. In particular, the reduction value of the frontal angle of the toothing is at least 8° along the entire longitudinal direction. The reamer according to claim 1, wherein